If you decide to remove it within 10 minutes of posting, you can just edit it to say something like Removed by Me. After your 10 minutes to edit are up, you might be out of luck. Your best bet would be to flag it, and send a PM to a moderator asking for it to be removed. However, the removal of the post will be up to the moderators’ discretion. They may not grant all requests, as some posts may be useful for other users, even if you no longer wish for it to be up. Long story short; be careful what you post.